Why would only
some debris fall but not the others? The manga picks and chooses sure but there must be a reason only a fraction of the debris reaches earth and not the others.
So the arguement is that because we don’t have any evidence of the entire mass of debris was launched into space at escape velocity, which is a fair argument. The main point is the ring itself, why would the ring form in the first place?
The debris is catapulted straight up in the air, if indeed it didn’t reach escape velocity, then eventually gravity would make all of it rain back down on the moon. This is backed up again
as we see the debris traveling upwards with the explosion but the thing is in the very next panel a ring begins to form. In order for a ring to form then the debris would have to have not only been traveling up very fast, but to the side as well. As there is seemingly no sideways force applied to the debris to it into orbit, if it indeed were just left by tetsuo it would have simply fell to the surface. Instead it moves sideways for “no reason” and forms a ring, which in itself is stationed
quite far from the moon. That’s not even touching on the timeframe, which is no longer than an hour, a ring couldn’t possibly form that fast. An outside force must have acted on the debris in order for it to form, Tetsuo must have made the ring by stopping the debris from escaping the moon and forming it into a ring. This also would explain why only some debris rains down to Earth and is a logical explanation.